Knight of the White Orchid was the gold standard for white mana ramp for a long time, and it has only recently had challenges from cards like Loyal Warhound and Cartogropher's Hawk
Theyre happy to have that one special card to show off
I can think of more than a few uses for it, and most of them blend with Sol Ring.

Acererak the Archlich Asmodeus the Archfiend Barrowin of Clan Undurr Bruenor Battlehammer Delina, Wild Mage Drizzt Do'Urden Ebondeath, Dracolich Ellywick Tumblestrum Eye of Vecna Farideh, Devil's Chosen Grand Master of Flowers Grazilaxx, Illithid Scholar Gretchen Titchwillow Hama Pashar, Ruin Seeker Hand of Vecna Icingdeath, Frost Tyrant Inferno of the Star Mounts Instrument of the Bards Iymrith, Desert Doom Kalain, Reclusive Painter Krydle of Baldur's Gate Lolth, Spider Queen Minsc, Beloved Ranger Mordenkainen Nadaar, Selfless Paladin Old Gnawbone Orcus, Prince of Undeath Oswald Fiddlebender Shessra, Death's Whisper Targ Nar, Demon-Fang Gnoll The Blackstaff of Waterdeep The Book of Exalted Deeds The Book of Vile Darkness The Deck of Many Things The Tarrasque Tiamat Trelasarra, Moon Dancer Varis, Silverymoon Ranger Volo, Guide to Monsters Xanathar, Guild Kingpin Zalto, Fire Giant Duke Zariel, Archduke of Avernus

6 Omnath, Locus Of All Omnath, Locus of All is the fifth and final incarnation of the legendary elemental named Omnath, and this time, Omnath got completed as a Phyrexian beast
Pro tip: If youre making an Atarka deck for a newbie to borrow, maybe leave out that showcase copy of Incinerator of the Guilty, especially if you dont feel like explaining how the heck collecting evidence works